https://s3.us-east-1.amazonaws.com/libra-easystore-production.lib.virginia.edu/libraetd/q237hs730/PHD_AspenRClements.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Checksum-Mode=ENABLED&X-Amz-Credential=AKIAIKM6AN7XWPD7CIUA%2F20260812%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20260812T183304Z&X-Amz-Expires=3600&X-Amz-SignedHeaders=host&x-id=GetObject&X-Amz-Signature=ea16d13d57f5c8c308360d62fec0021a0e8facea703e03d1e9fb7ad0224f1ccb